No abstract

Boron nitride nanotubes (BNNT) were synthesized over both Fe 3+ impregnated MCM-41 (mobil composition of matter no. 41) and Fe 2 O 3 /MCM-41 complex catalyst systems at relatively low temperatures for 1 h by the chemical vapor deposition technique in large quantities. The formation of BNNT was tailored at different reaction temperatures by changing catalyst type. The use of Fe 3+ -MCM-41 and Fe 2 O 3 as a complex catalyst system led to thin and thick tube formations. The diameters of BNNTs were in the range of 2.5−4.0 nm for thin tubes and 20−60 nm for thick tubes. The thin tube formation originated from the growth of BNNT over Fe 3+ -MCM-41 due to its average pore size of 4 nm. Higher reaction temperatures caused both BNNT and iron-based side product formations. The hydrogen uptake capacity measurements by the Intelligent Gravimetric Analyzer at room temperature showed that BNNTs could adsorb 0.85 wt % hydrogen which was two times larger than that for commercial carbon nanotubes.

No abstract

; (2019), Numerical and experimental approach of various sectioned new concept of the crash-boxes to determine the reliability and crashworthiness of the vehicles during frontal impacts.